How do you take a 1990 Chevy g van gas tank off?

How do you take a 1990 Chevy g van gas tank off?
that's easy... first make sure it is completely empty cuz just a lil bit of gas makes it alot harder.... you are gonna need two car ramps for the front tires and two jack stands to hold up the rear end.... once you have the car up in the air.... u'll need a floor jack and a piece of wood(about the size of the tank)..... jack up the floor jack till it is almost pushing on the tank but not too much.... remove the straps and the spout coming from the gas cap.... once it's free lower the floor jack very slowly till there is a clearance between the tank and cab next remove the fuel lines from the top of gas tank and wires from the fuel pump.... then lower jack all the way down and it's out...